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By Thomson Henderson, M.D. Pp. 230, with 630 illustrations. Grune & Stratton, Inc., 381 4th Ave., New York 16, 1950.

Arch Ophthal. 1950;44(5):758-760.

	Since this article does not have an abstract, we have provided the first 150 words of the full text PDF and any section headings.

1. Deviations from the Two-Quanta Explanation for Threshold-Values When the Flash-Time and the Visual-Angle of the Test Spot are Large
   
   1. Our Confirmation of the Two-Quanta Theory When t < and d < D
      
   2. Discussion of the Deviations
      
   
   
2. The Two-Quanta Hypothesis as a General Explanation for the Behaviour of Threshold-Values for the Several Receptors of the Human Eye
   
   1. The Experimental Arrangement
      
   2. The Peripheral Threshold-Measurements
      
   3. The Central-Foveal Threshold-Measurements
      
   4. The Mutual Dependence of the Receptors of Different Kinds in the Retina
      
   
   
3. Some Properties of the Nervous System of the Visual Sense
   
   1. The Nerve-Elements
      
   2. Some Properties of the Transmission in the Nervous System
      
   
   
4. The Sensitivity Dependence on Wave-Length for Foveal and Peripheral Vision and the Fundamental Response Curves
   
   1. Introduction
      
   2. The Peripheral Sensitivity Measurements
      
   3. The Foveal Sensitivity Measurements
      
   
   
5. The Quanta-Explanation and the Brightness-Impression
   
   1. The Experiments
      
   2. Discussion
      
   
   

1. Dependence on
   

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